Jeremy Gay's book is one of the better guides to setting up an aquarium, whether you are new to fish keeping, or want to upgrade your current set-up. There are more detailed guides to choosing fish, and people who want to specialise in marine fish really need a more specialised guide. The strength of this book is in providing information on the general principles you need to bear in mind to keep fish healthy, whether cold water, tropical or marine. There are chapters on setting up the tank, there's a lot on filtration and water quality, as well as a fair bit on fish health. Jeremy Gay has a lot of experience in this field. He is deputy editor of Practical Fishkeeping magazine, and has researched fishkeeping both in the UK and abroad. His adventures include trips to study fish in the wild, in exotic places such as the Amazon.